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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c7bf9bf1dc89cc8f426a93bed9d8f39a1ead49217c18e8098720a98a76213f' 
  AND token = 'A/RzQ1R/6xaU0eRnPGsyxm2xbPA3ZWn1dL1MIYBy3Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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