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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502cc2d2e49236582dcd7bc1804f9c734c911f6b84d56847b7c14d0f05d8646e' 
  AND token = 'YcZ3jEs6z6YAOhvOsY8JysPxOH8n4qsYLB1Lc8P/glk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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