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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715eed7f4aefde4c08cbfc8522d60770a90fdd55727048eb8cd9b2e7f911b288' 
  AND token = 'PUzD8LomZo1u5p0zec458nhkHvnDIBRDbvelMwD/Ks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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