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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c339ed8350fa4ce29cfff0aeafc76481d277899a76cea7409438dcc3e8a21abb' 
  AND token = 'DjDNbC3jkJPYud3F3yqGPjiUyRE89Rn/LLd//k32KNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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