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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b85422f39c574aff3273d87f90c37c8e0f7fbfc65903a425b632bc39b24df6c' 
  AND token = '3JeZoRZpT2VREjLJdHXCTrJkL1yjFfH/f2cJexOrykQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}