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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d137b26d5e3085fd4ff85c384e382e3fb76db5391f1aa0f9a02b58373970086' 
  AND token = 'a7b7M6sjw4fCTlq/Emnep7vh3+Bw+kOlk/rvxzrDkbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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