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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315f7d1443c2404746c76f5660a62688fcc0a77f590f79216f6f350fe8868c10' 
  AND token = 'GHHV/D9BSLgaB5aiJ2PW9372GG4nJRcPBI60vYcuvn0=' 
  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"
    }
  }
}