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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6713aabd48b1d1f11068c43b7aa7246b4a11758a2f7c37a00888e84d9d4a5' 
  AND token = 'aZQPqjSqPB85xsVDXc5kyPozQnaPNQ0yniIpZTG/R8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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