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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed214cff853cf8e8f2e02b7ec43a8ffc7b4fd0ffba02a192b8687bdd26777cb' 
  AND token = 'oveXFMAA1U3A6/Gq6Cg+mXNdCpBKtNiuyHMCX1CPA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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