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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300a5e525fb1b06f5490a28108d23c8f50fd9b36b9884b5053c5aaf040c93459' 
  AND token = 'HGPqguIWiiDVtlS4z/lxj2xKEqjmog7p30Qjw5a9P8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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