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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c19f23b62cb05938bdeb7f7b8f432202f402faaf4be25e18205a05874ad8139' 
  AND token = 'nTevKppfns9VsJ+VkOaltmhhk6vq2r33LQrdQwYJY0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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