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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc51315574afbac040998295b768367ab895dd7403d888a05dbda1ecb5e6d117' 
  AND token = '7c5A/Rd6jDzmBha78FV/x0FORS1+GJDQ85KRD2C+AYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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