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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac584abe846c3f0fd62b384552e5f14d85a5f150538da508b28794648ae4b022' 
  AND token = 'Caz7pnjMAcq3XyhUL/7VS0xbn6HmJa3Pz7D23VFAN+s=' 
  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"
    }
  }
}