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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0186e119925a2c8ae9530aa7196657ace08b78769dbf937c55a3f8bd1f95d002' 
  AND token = '4RwyVSIo9lpjX1cLk0lN321SkhsBp+z11JLbvDudHjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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