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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149be5b2fe47f936c5e1dc400bc4ceda12e853e81fb0b9b4263b1319e41a8d54' 
  AND token = 'i7l6psm+SrLcyRkZNzT2n6aGichBshplMjG6XCWzz3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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